An aerodynamic deflector device for a wheel of a motor vehicle, including: a support that is elongate and designed to be mounted on a motor vehicle; a deflecting wall mounted such that it is movable on the support between a retracted position in which the deflecting wall is raised in relation to the support in the mounted state, and a deployed position in which the deflecting wall is lowered in relation to the support in the mounted state; and an actuator designed to move the deflecting wall between the retracted and deployed positions. The deflecting wall is mounted such that it can be rotatably moved on the support about an axis of rotation oriented substantially parallel to a longitudinal axis of the support and driven by the actuator.